are more prone to depression than those in poorer countries like india or mexico. in face to face interviews with nearly 90,000 people around the world, researchers found that on average, 15% of those in wealthier nations have suffered depression at some point in their lives. that's versus just 11% in lower income countries. here with more on the study is psychiatrist dr. game salts. can you tell me why people in wealthier nations seem more prone to depression? >> we can only hypothesize. the study didn't look for the reasons. why i think a few thing we could conjecture, in poorer nations, first of all, it is more typical to turn to family. if you think about it, in poorer nations, families often live together in close circle them do a lot of the childcare. they do a lot of the marital advice. and we know that actually, close family and social supports are protective against depression. additionally in poorer nations, often people are more turning to religion, spirituality. that also is viewed as protective against depression. and on the contrary side, in terms of